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https://github.com/moparisthebest/curl
synced 2024-08-13 17:03:50 -04:00
365c5ba395
When doing multi-part formposts, libcurl used a pseudo-random value that was seeded with time(). This turns out to be bad for users who formpost data that is provided with users who then can guess how the boundary string will look like and then they can forge a different formpost part and trick the receiver. My advice to such implementors is (still even after this change) to not rely on the boundary strings being cryptographically strong. Fix your code and logic to not depend on them that much! I moved the Curl_rand() function into the sslgen.c source file now to be able to take advantage of the SSL library's random function if it provides one. If not, try to use the RANDOM_FILE for seeding and as a last resort keep the old logic, just modified to also add microseconds which makes it harder to properly guess the exact seed. The formboundary() function in formdata.c is now using 64 bit entropy for the boundary and therefore the string of dashes was reduced by 4 letters and there are 16 hex digits following it. The total length is thus still the same. Bug: http://curl.haxx.se/bug/view.cgi?id=1251 Reported-by: "Floris"
60 lines
1.1 KiB
Plaintext
60 lines
1.1 KiB
Plaintext
<testcase>
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<info>
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<keywords>
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HTTP
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HTTP FORMPOST
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</keywords>
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</info>
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# Server-side
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<reply>
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<data>
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HTTP/1.1 200 OK swsclose
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Date: Thu, 09 Nov 2010 14:49:00 GMT
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Server: test-server/fake
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Content-Length: 11
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blablabla
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</data>
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</reply>
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# Client-side
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<client>
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<server>
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http
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</server>
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<name>
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HTTP RFC1867-type formposting with custom Content-Type
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</name>
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<command>
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http://%HOSTIP:%HTTPPORT/want/277 -F name=daniel -H "Content-Type: text/info"
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</command>
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</client>
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# Verify data after the test has been "shot"
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<verify>
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<strip>
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^User-Agent:.*
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</strip>
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<strippart>
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s/^--------------------------[a-z0-9]*/--------------------------/
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s/boundary=------------------------[a-z0-9]*/boundary=------------------------/
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</strippart>
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<protocol>
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POST /want/277 HTTP/1.1
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User-Agent: curl/7.10.4 (i686-pc-linux-gnu) libcurl/7.10.4 OpenSSL/0.9.7a ipv6 zlib/1.1.3
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Host: %HOSTIP:%HTTPPORT
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Accept: */*
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Content-Length: 145
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Expect: 100-continue
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Content-Type: text/info; boundary=------------------------
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--------------------------
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Content-Disposition: form-data; name="name"
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daniel
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----------------------------
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</protocol>
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</verify>
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</testcase>
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